From: Eduardo Valentin eduardo.valentin@ti.com
This patch adds to tmp102 temperature sensor the possibility to expose itself as thermal zone device, registered on the thermal framework.
The thermal zone is built only if a device tree node describing a thermal zone for this sensor is present inside the tmp102 DT node. Otherwise, the driver behavior will be the same.
Note: This patch has also been reviewed by Jean D. He has requested to perform a wider inspection of possible users of thermal and hwmon interaction API. On the other hand, the change on this patch is acceptable on first step of overall code change.
Cc: Jean Delvare khali@linux-fr.org Cc: lm-sensors@lm-sensors.org Cc: linux-kernel@vger.kernel.org Acked-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Eduardo Valentin eduardo.valentin@ti.com (cherry picked from commit 6a027523f30f1cc90037686e6a682d15c6a555d6)
Signed-off-by: Alex Shi alex.shi@linaro.org --- drivers/hwmon/tmp102.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
diff --git a/drivers/hwmon/tmp102.c b/drivers/hwmon/tmp102.c index d7b47ab..6748b45 100644 --- a/drivers/hwmon/tmp102.c +++ b/drivers/hwmon/tmp102.c @@ -27,6 +27,8 @@ #include <linux/mutex.h> #include <linux/device.h> #include <linux/jiffies.h> +#include <linux/thermal.h> +#include <linux/of.h>
#define DRIVER_NAME "tmp102"
@@ -50,6 +52,7 @@
struct tmp102 { struct device *hwmon_dev; + struct thermal_zone_device *tz; struct mutex lock; u16 config_orig; unsigned long last_update; @@ -93,6 +96,15 @@ static struct tmp102 *tmp102_update_device(struct i2c_client *client) return tmp102; }
+static int tmp102_read_temp(void *dev, long *temp) +{ + struct tmp102 *tmp102 = tmp102_update_device(to_i2c_client(dev)); + + *temp = tmp102->temp[0]; + + return 0; +} + static ssize_t tmp102_show_temp(struct device *dev, struct device_attribute *attr, char *buf) @@ -204,6 +216,12 @@ static int tmp102_probe(struct i2c_client *client, goto fail_remove_sysfs; }
+ tmp102->tz = thermal_zone_of_sensor_register(&client->dev, 0, + &client->dev, + tmp102_read_temp, NULL); + if (IS_ERR(tmp102->tz)) + tmp102->tz = NULL; + dev_info(&client->dev, "initialized\n");
return 0; @@ -220,6 +238,7 @@ static int tmp102_remove(struct i2c_client *client) { struct tmp102 *tmp102 = i2c_get_clientdata(client);
+ thermal_zone_of_sensor_unregister(&client->dev, tmp102->tz); hwmon_device_unregister(tmp102->hwmon_dev); sysfs_remove_group(&client->dev.kobj, &tmp102_attr_group);